* Move pattern from `wptexturize()` into a separate function.
* Move pattern from `wp_html_split()` into a separate function.
* Beautify code for `wp_html_split()`.
* Remove unnecessary instances of `/s` modifier in patterns that don't use dots.
* Add `tests/phpunit/data/formatting/whole-posts.php` for testing larger strings.
* Add function `benchmark_pcre_backtracking()`.
* Add tests for `wp_html_split()`.
* Add tests for `wptexturize()`.
* Add tests for `get_shortcode_regex()`.
Props miqrogroove.
Fixes#34121.
git-svn-id: https://develop.svn.wordpress.org/trunk@34761 602fd350-edb4-49c9-b593-d223f7449a82
Scott Taylor